Tubular boiler



(No Model.) 2 SheetsL-Sheet 41.

S. MUNSON.. TUBULAR BOILER.

2 Sheets-Sheet 2.

Patented Feb. 16, 1897.

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S. MUNSON.

TUBULAR BOILER.

(No Model.)

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WITNESSES:

SWENEY MUNSON, OF SAYRE, PENNSYLVANIA.

TUB'ULAR BOILER.

SPECIFICATION forming part cf Letters Patent No. 577,310, dated February 16, 1897.

Application led May 28, 1896. Serial No. 593,433. (No model.)

To all whom it may concern:

Be it known that I, SWENEY MUNSON, of Sayre, in the county of Bradford and State of Pennsylvania, have invented new and useful Improvements in Tubular Boilers, of which the following is a full, clear, and exact de-A scription.

This invention relates particularly to locomotive or tubular boilers; and the object is to provide a boiler in which the number of stay-bolts employed is very much less than the number at present employed to reduce leaky flues to a minimum and in which there is a greatly-increased heating-surface, and, furtheigto so construct the boiler that every tube can be easily inspected and cleaned.

I will describe a boiler embodying my in vention and then point out the novel features in the appended claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure l is a longitudinal section, 'on the line l 1 of Fig. 2, of a boiler embodying my invention. Fig. 2 is a section on the line 2 2 of Fig. 1, and Fig. 3 is a sectional View showing a tube-joint employed.

Referring to the drawings, A designates the outer shell of the boiler, having in its forward portion a crown-sheet A', forming a combustion-chamber which has the usual lire-door a. This crown-sheet A being transversely arched is substantially self-supporting, but it may be further strengthened or supported by means of arched beams ai', which extend around the outer side of the crown-sheet and are connected thereto by means of bolts a2. The lower edges of the crown-sheet are bolted to the inwardly and upwardly extended ends of the wall of the combustion-chamber, the inner surface of said wall being here shown as provided with asbestos d3, there being an air-space between the lining and wall.

The space between the front wall A2 of the outer shell A and the front head A3 of the crown-sheet and of the combustion-chamber forms a water-leg, and a water-leg is formed at the rear portion of the combustion-chamber by means of the end wall A4 and the end wall A5. Diagonal brace-rods d4`are extended from the inner side of the head-plate A2 to connections with perforated lugs secured to the inner side of the outer shell A, as plainly indicated in Fig. l, and horizontal brace-rods a5 extend from the head-plate A2 through the head A3 and through the wall A4 to a connection with the wall A5.

A manifold B is arranged rearward of the combustion-chamber, and a series of flues communicate at one end with the interior of this manifold by the uesB' and at the other end with a waterleg Extended rearward from the manifold B is an inner boiler-shell B2, which connects at its rear end with a manifold B5, and extended from the manifold B to the manifold B3 are a series of water-tubes B4. These manifolds B B3 are made substantially ring shape and communicate at their lower portions with the water-space between the lower portion of the outer shell and the lower portion of the inner shell, and each has a steam-opening b2, communicating with the space between the upper portion of the inner and outer shells.

Supported centrally within the manifold B is a wate1-boxb4,and supported centrallywithin the manifold B3 is a water-box b5. These water-boxes have communication b with the material of their manifolds. Tubes B5 provide communication between the water-leg b and the water-box b4, and communication is provided betweenv the water-boxes b4 and b5 by means of tubes B5. The lower portions of the inner walls of the manifolds are inclined rearward, making large water-spaces 57, as

shown in Fig. l, and communication is pro-v vided between these water-spaces by means of tubes B7.

The head or wall A2 is provided with plugclosed openings bs, arranged opposite the ends of the several tubes, and the outer wall of the manifold B5 is provided with similar plugclosed openings b9, and the outer wall of the water-box b5 is provided with similar plugclosed openings. Obviously, by removing the plugs, access may be readily had to the several tubes.

A dry-steam pipe C extends from the upper portion of the steam-dome C out through the boiler in the usual manner. The lower portion of the outer shellAis inclined slightly downward and forward, and this lower portion of said outer shell directly opposite the IOO water-chambers D7 is provided with wash-out openings having screw-plugs c, and above the steam-outlet b' is provided a plug-closed opening c', and by removing the plug c water may be readily forced through the water-tubes, the manifolds, and other waterspaces to thoroughly clean the same.

For convenience in inserting the several tubes I form them each with a long section and a short section united by a suitable coupling. As here shown, the inner ends of the long sections are screwed into the walls of a manifold. Then the short sections are screwed into the boiler-head or end wall and the ends upset or riveted. The free end of the long section is provided with an annular shoulder c2 and the adjacent end of the short section is provided with an enlarged annular portion threaded on its outer side. A coupling-sleeve c3 has an inwardly-extending annular flange c4 at one end to engage against the shoulder c2, and it has an interior screwthread to engage the screw-thread on the short section. After the parts are inserted this coupling-sleeve is screwed into place; but it will be observed that there is a slight space between the ends of the sections, which will allow of the expansion and contraction of the tubes without bulging the boiler-head or the manifold-wall.

lt will be seen that in a boiler constructed as shown and described the crown-sheet may be readily inspected and cleaned at any time by simply removing the dome-cap, and this can be the more readily performed, as there are no stay-bolts between the crown-sheet and the outside shell to interfere with the inspection. Further, the cost to manufacture this boiler will be somewhat reduced in comparison to other boilers, inasmuch as there is very little stay-bolt tapping and drilling todo, and, further, this system of tubing may be inserted in any locomotive now in use by simply removing the flue sheets or walls and fire-pots.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. A locomotive or tubular boiler, comprising an outer shell, a crown-sheet arranged therein and forming a combustion-chamber, a water-leg forward of the crown-sheet, a manifold at the rear end of the crown-sheet, water-tubes providing communication between t-he water-leg and the manifold, an inner shell extended from said manifold to a connection with the manifold at the rear end of the boiler, and water-tubes connecting said two manifolds, the lower portion of the inner walls of said manifolds being inclined to provide enlarged water-spaces, substantially as specified.

2. A boiler, comprising an outer shell, an inner shell, a manifold at each end of said inner shell, water-flue connections between said two manifolds Within the inner shell, a crown-sheet forward of the inner shell and having' a water-leg between its end and the end of the outer shell, circulating-tubes extended through said crown-sheet, and a series of arched braces having connection with said crown-sheet, substantially as specied.

3. A locomotive or tubular boiler, comprising an out-er shell, an inner shell, water-tubes connecting manifolds in said inner shell, a

.crown-sheet forward of the inner shell, circulating-tubes extending through said crownsheet, and communicating with the tubes of the inner shell, and bracerods extending from the body of the outer shell to the end wall of said outer shell, substantially as specified.

4. A locomotive or tubular boiler, comprising an outer shell having a plug-closed opening at its top and plu g-closed wash-out openings through. its bottom, an inner shell, manifolds, at the ends of the inner shell, the said manifolds having enlarged water-spaces at their lower sides and communicating with the water space between the inner and outer shells, a crown-plate forming the upper portion of the combustion-chamber forward of said inner shell, longitudinal brace-rods extending through the lower portion of said combustion chamber, and diagonally disposed braee-rods extended from the body of the outer shell to a connection with the end wall thereof, substantially as specified.

5. A locomotive or tubular boiler, comprising ring-shaped manifolds, water-flue connections between said manifolds, water-boxes located centrally within said manifold and having communication therewith, and tubes connecting said water-boxes, substantially as specified.

SVENEY MUNSON.

Witnesses:

F. J. KROM, JOHN l?. Knncnnn.

IOO 

